2528972865 has 72 divisors (see below), whose sum is σ = 4740496488. Its totient is φ = 1246302720.

The previous prime is 2528972863. The next prime is 2528972867. The reversal of 2528972865 is 5682798252.

It is a happy number.

2528972865 is a `hidden beast` number, since 2 + 528 + 97 + 28 + 6 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (2528972863) and next prime (2528972867).

It can be written as a sum of positive squares in 4 ways, for example, as 214593201 + 2314379664 = 14649^2 + 48108^2 .

It is not a de Polignac number, because 2528972865 - 2¹ = 2528972863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2528972863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 664147 + ... + 667943.

It is an arithmetic number, because the mean of its divisors is an integer number (65840229).

Almost surely, 2^2528972865 is an apocalyptic number.

It is an amenable number.

2528972865 is a deficient number, since it is larger than the sum of its proper divisors (2211523623).

2528972865 is a wasteful number, since it uses less digits than its factorization.

2528972865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3887 (or 3865 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The square root of 2528972865 is about 50288.8940522657. The cubic root of 2528972865 is about 1362.4316475544.

The spelling of 2528972865 in words is "two billion, five hundred twenty-eight million, nine hundred seventy-two thousand, eight hundred sixty-five".